双馈风电机组Crowbar保护电阻阻值优化整定  

OPTIMAL SETTING FOR CROWBAR RESISTANCE OF DOUBLY FED INDUCTION GENERATOR

作　　者：王健[1,2] 严干贵[2] 郑超[3] 孙勇[4] 史坤鹏[4] 

机构地区：[1]华北电力大学电气与电子工程学院,北京102206 [2]东北电力大学电气工程学院,吉林132012 [3]中国电力科学研究院,北京100192 [4]国网吉林省电力有限公司调控中心,长春130021

出　　处：《太阳能学报》2015年第9期2269-2277,共9页Acta Energiae Solaris Sinica

基　　金：国家重点基础研究发展(973)计划(2013CB228201);国家电网公司科技项目"风电大规模脱网的机理分析与应对措施研究";"风电并网基础研究平台建设与检测能力提升"和"电网友好型大型风电场关键技术研究与示范"

摘　　要：电网发生故障导致双馈感应发电机转子绕组经Crowbar保护电阻Rcb短接后,将引发风电机组后续的暂态过程。在后续的暂态过程中,如果Rcb阻值不当,一方面将危及转子侧变流器运行安全,另一方面将导致风电机组电磁转矩和机械转矩不能达到新的平衡,引起转子加速,可能触发超速保护动作,致使风电机组发生超速脱网。仅考虑保障转子侧变流器运行安全整定Rcb阻值,将使风电机组存在超速脱网风险。分析Rcb阻值对Crowbar保护动作后双馈风电机组转矩平衡关系的影响,推导双馈风电机组发生超速脱网的边界条件。在此基础上,提出综合考虑保障转子侧变流器运行安全和降低超速脱网风险的Rcb阻值优化整定方法。仿真结果表明方法的有效性。Rotor windings of a DFIG are short-circuited via resistance Rob due to Crowbar action triggered by faults in grid, which stimulates the subsequent transient processes. During the subsequent transi of converter on rotor side was threatened and the over-speed protection may be triggered ent processes, operating security due to the rotor speed exceeding limitation caused by unbalance between electromagnetic torque and mechanical torque of rotor, which lead to DFIGs tripping off from grid. Considering operating security of converter on rotor side only, setting of Rob makes DFIGs face the risk of tripping off from grid caused by over-speed protection action. The impacts of Rob on balance between electromagnetic torque and mechanical torque of rotor after Crowbar action were analyzed and the criterion for checking over-speed was deduced. Based on this, the strategy for optimal setting of Rob is proposed taking account of operating security of converter on rotor side and reducing the risk of DFIGs tripping off from grid caused by over-speed protection action. The simulation results showed that the proposed method is effective.

关 键 词：风力发电 双馈感应发电机 Crowbar保护 超速 

分 类 号：TM343[电气工程—电机]